Which GPS Module is Best: BN180, BN220, BN880, 7M, M8N, M8P?

TL;DR

The microblocks GPS modules generally perform better than the Beitian modules in terms of accuracy and stability. Despite fewer satellites, the Neo7M and M8P modules deliver reliable results. The BN180 module struggles with retaining settings and offers less consistent performance compared to others.

Transcript

hello i was just going for a stroll out in the field today it's rather nice calm weather nice and sunny for a change and i came across this strange looking thing here looks to me like somebody has set up a couple of espus mixers this wire i think is just for power between them from big bertha kind of battery there and we have over here four gps's a... Read More

Key Insights

• Microblocks modules perform measurably better than Beitian modules in accuracy and stability.
• The number of satellites is not the sole determinant of GPS performance; fewer satellites can still yield reliable results.
• Neo7M module, despite being older hardware, performs well due to its active antenna.
• BN180 module has issues with retaining settings, affecting its reliability in various applications.
• Latitude fluctuations are more pronounced than longitude fluctuations, possibly due to geographical positioning.
• BN220 module showed some deviation, possibly due to physical wear or environmental factors.
• The M8P module, with a larger antenna, provides the most stable results among tested modules.
• The daisy chain logging setup allows efficient data collection from multiple GPS modules simultaneously.

Questions & Answers

Q: How do microblocks GPS modules compare to Beitian modules?

Microblocks GPS modules generally offer better accuracy and stability compared to Beitian modules. They perform better in tests, showing less fluctuation in position data. Despite using fewer satellites, microblocks modules like the Neo7M and M8P deliver reliable results, making them more suitable for precision applications like drones and RC planes.

Q: Why is the number of satellites not the only performance metric for GPS modules?

The number of satellites is not the sole performance metric because other factors, such as satellite positioning, signal quality, and module hardware, also influence GPS accuracy. Modules like the Neo7M and M8P perform well with fewer satellites, indicating that quality and configuration can compensate for a lower satellite count.

Q: What issues does the BN180 module face?

The BN180 module struggles with retaining settings, such as baud rate configurations, which affects its reliability. Users report inconsistent performance, particularly when used with systems like ArduPilot. Despite being slightly smaller and lighter, its performance doesn't justify its use over more reliable options like the BN220.

Q: How does geographical positioning affect GPS module performance?

Geographical positioning affects GPS performance, particularly in latitude and longitude fluctuations. As one moves closer to the poles, the size in meters of one degree of longitude decreases, potentially leading to less fluctuation in longitude compared to latitude. This geographical factor influences how GPS data is interpreted and visualized.

Q: What advantages does the M8P module offer?

The M8P module offers advantages such as a larger antenna and the potential for RTK (Real-Time Kinematic) capabilities, providing more stable and accurate positioning data. In tests, it demonstrated superior stability, making it ideal for applications requiring high precision. Its performance highlights the benefits of investing in quality GPS hardware.

Q: How does the daisy chain logging setup work for GPS modules?

The daisy chain logging setup allows data from multiple GPS modules to be collected efficiently. Each module sends its data to the next in the chain, with the final module logging all data to a single SD card. This setup simplifies data processing and ensures synchronized data collection, enhancing the analysis of GPS performance across modules.

Q: What are the key takeaways from the GPS module comparison?

Key takeaways include the superior performance of microblocks modules over Beitian ones, the minimal impact of satellite count on performance, and the reliability of older modules like the Neo7M. The BN180 module's setting retention issues highlight the importance of module selection based on application needs. Accurate data logging setups enhance performance analysis.

Q: Why might the BN220 module show deviation in tests?

The BN220 module might show deviation due to physical wear, environmental factors, or manufacturing inconsistencies. In tests, it displayed more fluctuation than expected, possibly influenced by factors like antenna placement, module handling, or external interference. Regular maintenance and careful setup can mitigate some of these deviations.

Summary & Key Takeaways

• Microblocks GPS modules outperform Beitian modules in accuracy and consistency across tests. Despite using fewer satellites, modules like the Neo7M and M8P deliver reliable results, showcasing that satellite count isn't the only performance metric.

• The BN180 module presents challenges with setting retention, affecting its reliability. For applications requiring precision, microblocks modules are preferable due to their superior performance and stability.

• Latitude fluctuations are more pronounced than longitude, possibly due to geographical positioning. The M8P module, with a larger antenna, provides the most stable results, emphasizing the importance of quality hardware in GPS performance.